大体的说下，Linux下目前比较流行的加密方法有两种：
第一种方法：采用gzexe加密，严格来讲，gzexe这种脚本加密方式不是加密，而是把代码进行了压缩，但是这种方式能够满足一般的加密用途，可以隐蔽脚本中的密码等信息。它是使用Liunx系统环境下自带的gzexe程序，它不但加密，同时压缩文件。
gzexe加密linux脚本的使用方法:
gzexe file.sh /它会把原来的文件备份为 file.sh~ ,同时 file.sh 即被变成加密后的可执行文件
使用gzexe加密的shell脚本代码特征为：前面一段代码是正常的命令字符，到了后面某一行开始就全部为乱码，示例如下
#!/bin/sh
skip=44
tab=' '
nl='
'
IFS=" $tab$nl"
umask=`umask`
umask 77
gztmpdir=
trap 'res=$?
test -n "$gztmpdir" && rm -fr "$gztmpdir"
(exit $res); exit $res
' 0 1 2 3 5 10 13 15
if type mktemp >/dev/null 2>&1; then
gztmpdir=`mktemp -dt`
else
gztmpdir=/tmp/gztmp$$; mkdir $gztmpdir
fi || { (exit 127); exit 127; }
gztmp=$gztmpdir/$0
case $0 in
-* | */*'
') mkdir -p "$gztmp" && rm -r "$gztmp";;
*/*) gztmp=$gztmpdir/`basename "$0"`;;
esac || { (exit 127); exit 127; }
case `echo X | tail -n +1 2>/dev/null` in
X) tail_n=-n;;
*) tail_n=;;
esac
if tail $tail_n +$skip <"$0" | gzip -cd > "$gztmp"; then
umask $umask
chmod 700 "$gztmp"
(sleep 5; rm -fr "$gztmpdir") 2>/dev/null &
"$gztmp" ${1+"$@"}; res=$?
else
echo >&2 "Cannot decompress $0"
(exit 127); res=127
fi; exit $res
?? Wopenvpn ?ks /此处开始乱码
gzexe加密shell解密思路：跟踪代码的执行过程可以发现，脚本执行到某一步的时候会生成临时解密的shell脚本
，整个脚本执行完之后再把临时解密shell脚本所在目录删除。有了这个发现，我们就找到了方法了。
/usr/bin/tail -n +44 file.sh >/tmp/1.gz /提取解密后的压缩文件1.gz到/tmp目录，其中的+44为上面的示例脚本中对应的乱码开始的地方 cd /tmp /切换到/tmp目录 gunzip 1.gz /解压解密后的文件，就可以得出解密后的代码了
第二种方法：使用Linux下脚本加密工具SHC对shell脚本进行加密，SHC可以将shell脚本转换为一个可执行的二进制文件。经过shc对shell脚本进行加密后，会同时生成两个新的文件，一个是加密后的可执行的二进制文件(name.sh.x)，另一个是C语言的原文件(name.sh.x.c)。shc加密工具的详细安装和使用教程我这里就不讲了，有兴趣的朋友自己搜一下有很多，使用也比较简单。在这里博主主要给大家分享一个SHC加密工具破解的方法，此破解工具来源于国外的大牛，详细的代码在下面，复制下面的脚本后另存为unshc.sh，然后执行脚本即可，会有提示告诉你怎么解密。
#!/bin/bash ################### # Author: Luiz Otavio Duarte a.k.a. (LOD) # 11/03/08 - v.0.1 # Updated: Yann CAM v0.2 - [email protected] | www.asafety.fr # 06/27/13 - v.0.2 # -- Adding new objdump format (2.22) to retrieve data (especially on Ubuntu distribution) # -- Patch few regex with sorted address list # Updated: Yann CAM v0.3 - [email protected] | www.asafety.fr # 18/11/15 - v.0.3 # -- Adapt script for new architecture # -- Clean and optimize functions # -- Add an (unsigned long) cast in shc C source code # Updated: Yann CAM v0.3 - [email protected] | www.asafety.fr # 14/12/15 - v.0.4 # -- Comment specific return statement in C source # Updated: Yann CAM v0.5 - [email protected] | www.asafety.fr # 15/12/15 - v.0.5 # -- Patch extract arc4 function to keep the latest offset only # Updated: Yann CAM v0.5 - [email protected] | www.asafety.fr # 16/12/15 - v.0.6 # -- Add bash script options (getopts) ################### # Tested on : # Ubuntu 14.04.3 LTS x86_64 # Linux server 3.13.0-61-generic #100-Ubuntu SMP Wed Jul 29 11:21:34 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux # Linux version 3.13.0-61-generic (buildd@lgw01-50) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #100-Ubuntu SMP Wed Jul 29 11:21:34 UTC 2015 # # CentOS release 6.6 (Final) x86_64 # Linux server 2.6.32-504.23.4.el6.x86_64 #1 SMP Tue Jun 9 20:57:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux # Linux version 2.6.32-504.23.4.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) ) #1 SMP Tue Jun 9 20:57:37 UTC 2015 # # Debian 7.8 i686 # Linux server 3.2.0-4-686-pae #1 SMP Debian 3.2.68-1+deb7u2 i686 GNU/Linux # Linux version 3.2.0-4-686-pae ([email protected]) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1 SMP Debian 3.2.68-1+deb7u2 ################### VERSION="0.5" OBJDUMP=`which objdump` GREP=`which grep` CUT=`which cut` SHRED=`which shred` UNIQ=`which uniq` SORT=`which sort` GCC=`which gcc` WC=`which wc` AWK=`which awk` SED=`which sed` TR=`which tr` HEAD=`which head` BINARY="" TMPBINARY=$(mktemp /tmp/XXXXXX) DUMPFILE="" STRINGFILE="" CALLFILE=$(mktemp /tmp/XXXXXX) CALLADDRFILE=$(mktemp /tmp/XXXXXX) CALLSIZEFILE=$(mktemp /tmp/XXXXXX) declare -A LISTOFCALL # Variable to know the index of variables. # This var is to loop on each 14 arc4() call with ordered args. j=0 # Simple usage help / man function usage(){ printf "[*] Usage : $0 [OPTIONS] <file.sh.x>\n" printf "\t -h | --help : print this help message\n" printf "\t -a OFFSET | --arc4 OFFSET : specify the arc4() offset arbitrarily (without 0x prefix)\n" printf "\t -d DUMPFILE | --dumpfile DUMPFILE : provide an object dump file (objdump -D script.sh.x > DUMPFILE)\n" printf "\t -s STRFILE | --stringfile STRFILE : provide a string dump file (objdump -s script.sh.x > STRFILE)\n" printf "\t -o OUTFILE | --outputfile OUTFILE : indicate the output file name\n\n" printf "[*] e.g : \n" printf "\t$0 script.sh.x\n" printf "\t$0 script.sh.x -o script_decrypted.sh\n" printf "\t$0 script.sh.x -a 400f9b\n" printf "\t$0 script.sh.x -d /tmp/dumpfile -s /tmp/strfile\n" printf "\t$0 script.sh.x -a 400f9b -d /tmp/dumpfile -s /tmp/strfile -o script_decrypted.sh\n" } # Clean all temp file created for this script function clean(){ $SHRED -zu -n 1 $DUMPFILE $CALLFILE $CALLADDRFILE $CALLSIZEFILE $STRINGFILE $TMPBINARY ${TMPBINARY}.c >/dev/null 2>&1 } # Clean error exit function after cleaning temp file function exit_error(){ clean exit 1; } # Check the availability of basic commands usefull for this script function check_binaries() { if [ ! -x ${OBJDUMP} ]; then echo "[-] Error, cannot execute or find objdump binary" exit_error fi if [ ! -x ${GREP} ]; then echo "[-] Error, cannot execute or find grep binary" exit_error fi if [ ! -x ${CUT} ]; then echo "[-] Error, cannot execute or find cut binary" exit_error fi if [ ! -x ${SHRED} ]; then echo "[-] Error, cannot execute or find shred binary" exit_error fi if [ ! -x ${UNIQ} ]; then echo "[-] Error, cannot execute or find uniq binary" exit_error fi if [ ! -x ${SORT} ]; then echo "[-] Error, cannot execute or find sort binary" exit_error fi if [ ! -x ${GCC} ]; then echo "[-] Error, cannot execute or find gcc binary" exit_error fi if [ ! -x ${WC} ]; then echo "[-] Error, cannot execute or find wc binary" exit_error fi } # Create dump files of encrypted script function generate_dump() { # DUMPFILE dump to retrive arc4 address, address and size of each arc4 arguments and pwd $OBJDUMP -D $BINARY > "$DUMPFILE" # STRINGFILE dump to retrieve pwd and arc4 argument $OBJDUMP -s $BINARY > "$STRINGFILE" } # Find out the most called function. This function is arc4() and there are 14 calls. # Update 27/06/2013 : Regexps updated to match new objdump format and retrieve the $CALLADDR from his number of call (bug initial with "sort") # Update 16/11/2015 : Adding new architecture support function extract_arc4_call_addr(){ CALLADDR=$($GREP -Eo "call.*[0-9a-f]{6,}" $DUMPFILE | $GREP -Eo "[0-9a-f]{6,}" | $SORT | $UNIQ -c | $SORT | $GREP -Eo "(14).*[0-9a-f]{6,}" | $GREP -Eo "[0-9a-f]{6,}" | tail -n 1) if [ -z "$CALLADDR" ]; then echo "[-] Unable to define arc4() call address..." exit_error fi echo "[+] ARC4 address call defined : [0x$CALLADDR]" } # Extract each args values of arc4 calls function extract_variables_from_binary(){ echo "[*] Extracting each args address and size for the 14 arc4() calls..." # Initialize the number of line before CALLADDR to looking for addresses of args i=2 # Retrieve ordered list of address var and put it to $CALLADDRFILE while [[ $($WC -l < $CALLADDRFILE) -ne 14 ]]; do $GREP -B $i "call.*$CALLADDR" $DUMPFILE | $GREP -v "$CALLADDR" | $GREP -Eo "(0x[0-9a-f]{6,})" > $CALLADDRFILE i=$(($i + 1)) if [ $i -eq 10 ]; then echo "[-] Unable to extract addresses of 14 arc4 args..." exit_error fi done # Initialize the number of line before CALLADDR to looking for sizes of args i=3 # Retrieve ordered list of size var and append it to $CALLSIZEFILE while [[ $($WC -l < $CALLSIZEFILE) -ne 14 ]]; do $GREP -B $i "call.*$CALLADDR" $DUMPFILE | $GREP -v "$CALLADDR" | $GREP -Eo "(0x[0-9a-f]+,)" | $GREP -Eo "(0x[0-9a-f]+)" | $GREP -Ev "0x[0-9a-f]{6,}" > $CALLSIZEFILE i=$(($i + 1)) if [ $i -eq 10 ]; then echo "[-] Unable to extract sizes of 14 arc4 args..." exit_error fi done #cat $CALLADDRFILE #cat $CALLSIZEFILE # For each full address in $CALLADDRFILE and corresponding size in $CALLSIZEFILE IFS=$'\n' read -d '' -r -a LISTOFADDR < $CALLADDRFILE IFS=$'\n' read -d '' -r -a LISTOFSIZE < $CALLSIZEFILE for (( x = 0; x < ${#LISTOFADDR[*]}; x = x+1 )) do i=${LISTOFADDR[$x]} NBYTES=${LISTOFSIZE[$x]} echo -e "\t[$x] Working with var address at offset [$i] ($NBYTES bytes)" # Some diferences in assembly. # We can have: # mov <adr>,%eax # push 0x<hex> # push %eax # call $CALLADDR # # or # # push 0x<hex> # push 0x<adr> # call $CALLADDR # # UPDATE 27/06/2013 : # Adding support of objdump format # New format supported (Debian 7 x86) : # # movl $0x<hex>,0x4(%esp) # # movl $0x<adr>,(%esp) # call $CALLADDR # # UPDATE 18/11/2015 : # Adding support of objdump format # Ubuntu 14.04 LTS x86_64 # # mov $0x<hex>,%esi # mov $0x<adr>,%edi # callq $CALLADDR <fork@plt+0x23b> # # Key is the address with the variable content. KEY=$(echo $i | $CUT -d 'x' -f 2) # A 2 bytes variable (NBYTES > 0) can be found like this: (in STRINGFILE) # ---------------X # X--------------- # # So we need 2 lines from STRINGFILE to make it all correct. So: NLINES=$(( ($NBYTES / 16) +2 )) # All line in STRINGFILE starts from 0 to f. So LASTBIT tells me the index in the line to start recording. let LASTBYTE="0x${KEY:$((${#KEY}-1))}" # Grep all lines needed from STRINGFILE, merge lines. STRING=$( $GREP -A $(($NLINES-1)) -E "^ ${KEY:0:$((${#KEY}-1))}0 " $STRINGFILE | $AWK '{ print $2$3$4$5}' | $TR '\n' 'T' | $SED -e "s:T::g") # Change string to begin in the line index. STRING=${STRING:$((2*$LASTBYTE))} # Cut the string to the number off bytes of the variable. STRING=${STRING:0:$(($NBYTES * 2))} # We need to convert to a \x??\x?? structure so: FINALSTRING="" for ((i = 0; i < $((${#STRING} /2 )); i++)); do FINALSTRING="${FINALSTRING}\x${STRING:$(($i * 2)):2}" done define_variable done } # arc4 function is called 14 times in the C code. # Each call is done with the same args sequence even if their declaration is randomized : # msg1, date, shll, inlo, xecc, lsto, tst1, chk1, msg2, rlax, opts, text, tst2 and chk2. function define_variable() { case "$j" in 0) VAR_MSG1=$FINALSTRING VAR_MSG1_Z=$NBYTES;; 1) VAR_DATE=$FINALSTRING VAR_DATE_Z=$NBYTES;; 2) VAR_SHLL=$FINALSTRING VAR_SHLL_Z=$NBYTES;; 3) VAR_INLO=$FINALSTRING VAR_INLO_Z=$NBYTES;; 4) VAR_XECC=$FINALSTRING VAR_XECC_Z=$NBYTES;; 5) VAR_LSTO=$FINALSTRING VAR_LSTO_Z=$NBYTES;; 6) VAR_TST1=$FINALSTRING VAR_TST1_Z=$NBYTES;; 7) VAR_CHK1=$FINALSTRING VAR_CHK1_Z=$NBYTES;; 8) VAR_MSG2=$FINALSTRING VAR_MSG2_Z=$NBYTES;; 9) VAR_RLAX=$FINALSTRING VAR_RLAX_Z=$NBYTES;; 10) VAR_OPTS=$FINALSTRING VAR_OPTS_Z=$NBYTES;; 11) VAR_TEXT=$FINALSTRING VAR_TEXT_Z=$NBYTES;; 12) VAR_TST2=$FINALSTRING VAR_TST2_Z=$NBYTES;; 13) VAR_CHK2=$FINALSTRING VAR_CHK2_Z=$NBYTES;; esac j=$(($j + 1)) } # The password is used in the key function right before first call to arc4. # So we need the previous call just before the first "call ARC4_CALLADDR" and its args. # Update 27/06/2013 : Add new objdump format # Update 18/11/2015 : Simplify extraction function extract_password_from_binary(){ echo "[*] Extracting password..." KEY_ADDR="" KEY_SIZE="" # Initialize the number of line before CALLADDR to watch i=5 while [[ ( -z "$KEY_ADDR" ) || ( -z "$KEY_SIZE" ) ]]; do $GREP -B $i -m 1 "call.*$CALLADDR" $DUMPFILE | $GREP -v $CALLADDR > $CALLFILE #cat $CALLFILE # Adjust these two next line to grep right addr & size value (depending on your architecture) KEY_ADDR=$($GREP -B 3 -m 1 "call" $CALLFILE | $GREP mov | $GREP -oE "0x[0-9a-z]{6,}+" | $HEAD -n 1) KEY_SIZE=$($GREP -B 3 -m 1 "call" $CALLFILE | $GREP mov | $GREP -v $KEY_ADDR | $GREP -oE "0x[0-9a-z]+" | $HEAD -n 1) i=$(($i + 1)) if [ $i -eq 10 ]; then echo "[-] Error, function call previous first call of arc4() hasn't been identified..." exit_error fi done echo -e "\t[+] PWD address found : [$KEY_ADDR]" echo -e "\t[+] PWD size found : [$KEY_SIZE]" # Defining the address without 0x. KEY=$(echo $KEY_ADDR | $CUT -d 'x' -f 2) # Like the other NLINES NLINES=$(( ($KEY_SIZE / 16) +2 )) # Like the other LASTBYTE LASTBYTE="0x${KEY:$((${#KEY}-1))}" # Extract PWD from STRINGFILE STRING=$( $GREP -A $(($NLINES-1)) -E "^ ${KEY:0:$((${#KEY}-1))}0 " $STRINGFILE | $AWK '{ print $2$3$4$5}' | $TR '\n' 'T' | $SED -e "s:T::g") STRING=${STRING:$((2*$LASTBYTE))} STRING=${STRING:0:$(($KEY_SIZE * 2))} # Encode / rewrite PWD in the \x??\x?? format FINALSTRING="" for ((i=0;i<$((${#STRING} /2 ));i++)); do FINALSTRING="${FINALSTRING}\x${STRING:$(($i * 2)):2}" done VAR_PSWD=$FINALSTRING } # This function append a generic engine for decrypt from shc project. With out own new variables extracted. # Rather than execute the source code decrypted, it's printed in stdout. function generic_file(){ cat > ${TMPBINARY}.c << EOF #define msg1_z $VAR_MSG1_Z #define date_z $VAR_DATE_Z #define shll_z $VAR_SHLL_Z #define inlo_z $VAR_INLO_Z #define xecc_z $VAR_XECC_Z #define lsto_z $VAR_LSTO_Z #define tst1_z $VAR_TST1_Z #define chk1_z $VAR_CHK1_Z #define msg2_z $VAR_MSG2_Z #define rlax_z $VAR_RLAX_Z #define opts_z $VAR_OPTS_Z #define text_z $VAR_TEXT_Z #define tst2_z $VAR_TST2_Z #define chk2_z $VAR_CHK2_Z #define pswd_z $KEY_SIZE static char msg1 [] = "$VAR_MSG1"; static char date [] = "$VAR_DATE"; static char shll [] = "$VAR_SHLL"; static char inlo [] = "$VAR_INLO"; static char xecc [] = "$VAR_XECC"; static char lsto [] = "$VAR_LSTO"; static char tst1 [] = "$VAR_TST1"; static char chk1 [] = "$VAR_CHK1"; static char msg2 [] = "$VAR_MSG2"; static char rlax [] = "$VAR_RLAX"; static char opts [] = "$VAR_OPTS"; static char text [] = "$VAR_TEXT"; static char tst2 [] = "$VAR_TST2"; static char chk2 [] = "$VAR_CHK2"; static char pswd [] = "$VAR_PSWD"; #define hide_z 4096 /* rtc.c */ #include <sys/stat.h> #include <sys/types.h> #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <unistd.h> /* 'Alleged RC4' */ static unsigned char stte[256], indx, jndx, kndx; /* * Reset arc4 stte. */ void stte_0(void) { indx = jndx = kndx = 0; do { stte[indx] = indx; } while (++indx); } /* * Set key. Can be used more than once. */ void key(void * str, int len) { unsigned char tmp, * ptr = (unsigned char *)str; while (len > 0) { do { tmp = stte[indx]; kndx += tmp; kndx += ptr[(int)indx % len]; stte[indx] = stte[kndx]; stte[kndx] = tmp; } while (++indx); ptr += 256; len -= 256; } } /* * Crypt data. */ void arc4(void * str, int len) { unsigned char tmp, * ptr = (unsigned char *)str; while (len > 0) { indx++; tmp = stte[indx]; jndx += tmp; stte[indx] = stte[jndx]; stte[jndx] = tmp; tmp += stte[indx]; *ptr ^= stte[tmp]; ptr++; len--; } } /* End of ARC4 */ /* * Key with file invariants. */ int key_with_file(char * file) { struct stat statf[1]; struct stat control[1]; if (stat(file, statf) < 0) return -1; /* Turn on stable fields */ memset(control, 0, sizeof(control)); control->st_ino = statf->st_ino; control->st_dev = statf->st_dev; control->st_rdev = statf->st_rdev; control->st_uid = statf->st_uid; control->st_gid = statf->st_gid; control->st_size = statf->st_size; control->st_mtime = statf->st_mtime; control->st_ctime = statf->st_ctime; key(control, sizeof(control)); return 0; } void rmarg(char ** argv, char * arg) { for (; argv && *argv && *argv != arg; argv++); for (; argv && *argv; argv++) *argv = argv[1]; } // Update 18/11/2015 : Update "mask" casting from "unsigned" to "unsigned long". int chkenv(int argc) { char buff[512]; unsigned mask, m; int l, a, c; char * string; extern char ** environ; mask = (unsigned long)chkenv; mask ^= (unsigned)getpid() * ~mask; sprintf(buff, "x%x", mask); string = getenv(buff); l = strlen(buff); if (!string) { /* 1st */ sprintf(&buff[l], "=%u %d", mask, argc); putenv(strdup(buff)); return 0; } c = sscanf(string, "%u %d%c", &m, &a, buff); if (c == 2 && m == mask) { /* 3rd */ rmarg(environ, &string[-l - 1]); return 1 + (argc - a); } return -1; } char * xsh(int argc, char ** argv) { char * scrpt; int ret, i, j; char ** varg; stte_0(); key(pswd, pswd_z); arc4(msg1, msg1_z); arc4(date, date_z); //if (date[0] && date[0]<time(NULL)) // return msg1; arc4(shll, shll_z); arc4(inlo, inlo_z); arc4(xecc, xecc_z); arc4(lsto, lsto_z); arc4(tst1, tst1_z); key(tst1, tst1_z); arc4(chk1, chk1_z); if ((chk1_z != tst1_z) || memcmp(tst1, chk1, tst1_z)) return tst1; ret = chkenv(argc); arc4(msg2, msg2_z); if (ret < 0) return msg2; varg = (char **)calloc(argc + 10, sizeof(char *)); if (!varg) return 0; if (ret) { arc4(rlax, rlax_z); if (!rlax[0] && key_with_file(shll)) return shll; arc4(opts, opts_z); arc4(text, text_z); printf("%s",text); return 0; /*arc4(tst2, tst2_z); key(tst2, tst2_z); arc4(chk2, chk2_z); if ((chk2_z != tst2_z) || memcmp(tst2, chk2, tst2_z)) return tst2; if (text_z < hide_z) { scrpt = malloc(hide_z); if (!scrpt) return 0; memset(scrpt, (int) ' ', hide_z); memcpy(&scrpt[hide_z - text_z], text, text_z); } else { scrpt = text; }*/ } else { if (*xecc) { scrpt = malloc(512); if (!scrpt) return 0; sprintf(scrpt, xecc, argv[0]); } else { scrpt = argv[0]; } } j = 0; varg[j++] = argv[0]; /* My own name at execution */ if (ret && *opts) varg[j++] = opts; /* Options on 1st line of code */ if (*inlo) varg[j++] = inlo; /* Option introducing inline code */ varg[j++] = scrpt; /* The script itself */ if (*lsto) varg[j++] = lsto; /* Option meaning last option */ i = (ret > 1) ? ret : 0; /* Args numbering correction */ while (i < argc) varg[j++] = argv[i++]; /* Main run-time arguments */ varg[j] = 0; /* NULL terminated array */ execvp(shll, varg); return shll; } int main(int argc, char ** argv) { argv[1] = xsh(argc, argv); return 1; } EOF } ########################################## ## Starting echo " _ _ _____ _ _ " echo "| | | | / ___| | | | " echo "| | | |_ __ \ `--.| |_| | ___ " echo "| | | | '_ \ `--. \ _ |/ __|" echo "| |_| | | | /\__/ / | | | (__ " echo " \___/|_| |_\____/\_| |_/\___|" echo echo "--- UnSHc - The shc decrypter." echo "--- Version: $VERSION" echo "------------------------------" echo "UnSHc is used to decrypt script encrypted with SHc" echo "Original idea from Luiz Octavio Duarte (LOD)" echo "Updated and modernized by Yann CAM" echo "- SHc : [http://www.datsi.fi.upm.es/~frosal/]" echo "- UnSHc : [https://www.asafety.fr/unshc-the-shc-decrypter/]" echo "------------------------------" echo if [ $# -lt 1 ]; then echo "[?] Type -h or --help for how to use it" clean exit 0 fi # Check the availability of each command needed in this script. check_binaries OPTS=$( getopt -o h,a:,d:,s:,o: -l help,arc4:,dumpfile:,stringfile:,outputfile: -- "$@" ) if [ $? != 0 ]; then exit_error; fi while [ "$#" -gt 0 ] ; do case "$1" in -h|--help) usage; clean; exit 0;; -a|--arc4) echo "[+] ARC4() offset function call address specified [0x$2]"; CALLADDR=$2; shift 2;; -d|--dumpfile) echo "[+] Object dump file specified [$2]"; DUMPFILE=$2; shift 2;; -s|--stringfile) echo "[+] String dump file specified [$2]"; STRINGFILE=$2; shift 2;; -o|--outputfile) echo "[+] Output file name specified [$2]"; OUTPUTFILE=$2; shift 2;; -*) echo "[-] Unknown option: [$1]" >&2; exit_error;; --) shift; break;; *) echo "[*] Input file name to decrypt [$1]"; BINARY=$1 shift 1;; esac done if [ ! -e $BINARY ]; then echo "[-] Error, File [$BINARY] not found." exit_error fi if [ -z "$DUMPFILE" ]; then DUMPFILE=$(mktemp /tmp/XXXXXX) else if [ ! -e $DUMPFILE ]; then echo "[-] Object dump file [$DUMPFILE] not found." exit_error; fi fi if [ -z "$STRINGFILE" ]; then STRINGFILE=$(mktemp /tmp/XXXXXX) else if [ ! -e $STRINGFILE ]; then echo "[-] String dump file [$STRINGFILE] not found." exit_error; fi fi # Fill DUMPFILE and STRINGFILE from objdump of the *.sh.x encrypted script generate_dump # Find out the most called function. This function is arc4() and there are 14 calls. if [ -z "$CALLADDR" ]; then extract_arc4_call_addr fi # Retrieve the data used in each CALLADDR call extract_variables_from_binary # Retrieve PWD from function call just before the first CALLADDR call extract_password_from_binary # Create a C source code to decrypt *.sh.x file with previously extracted data generic_file # Compile C source code to decrypt *.sh.x file $GCC -o $TMPBINARY ${TMPBINARY}.c >/dev/null 2>&1 echo "[*] Executing [$TMPBINARY] to decrypt [${BINARY}]" if [ -z "$OUTPUTFILE" ]; then echo "[*] Retrieving initial source code in [${BINARY%.x}]" $TMPBINARY > ${BINARY%.x} else echo "[*] Retrieving initial source code in [$OUTPUTFILE]" $TMPBINARY > $OUTPUTFILE fi echo "[*] All done!" clean exit 0